Connector-plug.



G. C. KNAUFF.

CONNECTOR PLUG.

APPLICATION FILED MAY26,1913.

Lfiggy) Patented Mar. 3, 1914.

411677465565: I 110622??? 5 y: (57 Qaflfl W 07 tilt GEORGE C. manure, OFCHICAGO, ILLINOIS.

CONNECTOR-PLUG.

Specification of Letters Patent.

Patented Mar. 3,1914.

Application filed May 26, 1913. Serial Nb. 769,947!

To-all whom it may concern Be it known that I, Gnoncn C. KNAUFF, citizenof the United States, residing at Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inConnector-Plugs; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to wire-attaching plugs and more particularly tothe class of plugs suitable for use with automobile lamp sockets inwhich the connection to one terminal of the lamp is made through thesocket casing.

One object of toy invention is to provide a simple construction by whicha metal shell housing-the end portion of the plug may be connected toone wire of the circuit and by which the said shell may be interlockedwith the socket when operatively connected to the socket.

Another object is to provide simple means for electrically connectingthe central terminal of the plug with the other wire of the circuit andforsecuring the insulating member between this central terminal and theheretofore mentioned shell of the plug.

I accomplish these objects by the construction shown in the accompanyingdrawings, in which Figure 1, is a longitudinal section through anattachment plug embodying my invention. Fig. 2 1s a similar sectionthrough an alternative embodiment ofmy invention and a portion of thesocket casing interlocked therewith. Fig. 3-. is an enlarged detail viewof the portion of the shell of the'plug having the interlocked formationthereon. Fig. 4 is a fragmentary view of a socket, lamp and plugembodying any invention.

In Fig. 1- the plug of my invention comprises an insulating body 1having a pair of longitudinal bores 2 therein, and having one endexternally threaded to match female threads upon a cap 3. The other endof the plug has a cylindrical exterior adapt:

ed to receive one end of a cylindrical brass or copper shell 4, whichshell is secured to the plug by a screw 5 threaded transversely into abrass terminal 6 housed in one of the bores 2, whereby the screw 5 formsan electrical connection between the shell 4 and the terminal The shell4 is of such diameter as to shdingly interfit the end of the casing 21of the socket to which the plug is to be attached, sockets suitable foruse with the plugs of my invention preferably having their casingsequipped with spring fingers as shown in my copending patentapplicatlon, Serial No. 769,948, filed 'May 26, 1913. Inserted in theother bore of the insulatin body 1 is a terminal 7 having an enlargedhead portion 8 adjacent to the end of the body 1 which is housed by aportion of the shell 4, this portion 8 and a part of the termmal 7adjacent thereto being bored out to form a cylinder for housing a brassor copper piston 9. The piston 9 is pressed outwardly by a spring 10,whereby the plunger 11 of the piston projecting through a perforation inthe head 8 is forced against a per1pheral portion of the head 12 of acon' tact member 13, which contact member is disposed axially of theplug.-

Interposed between the shank of the contact member 13 and the shell 4 isa cylinder 14 of insulating material, which cylinder has its outerperiphery chamfered to match the correspondingly diagonal shape of acontracted portion 15 at the forward end of the shell 4. Each of theterminals 6 and 7 has at its rear end'a perforation 16 adapted toreceive the bared end of one of the wires 17 and 18 of the circuit,which wires enter the cap 3 through an opening 19 in the rear endthereof. The shell 4 has intermediate of its ends a pair ofdiametrically opposite projections 20 formed thereon, the latter bemgpreferably formed by setting the shell into a die having a perforationtherein correspondin to the desired outside diameter of the saidprojection, and by then forcing the adjacent portion of the shell intothis perforation with a punch of considerably smaller diameter than thesaid perforation. When the opposed formations 20 have thus been raisedupon the surface of the shell 4, they constitute lugs or perforationsadapted to enter the slots 24 in the casing 21 of the socket with whichthe plug is to be used, the

riveted directly to the head 12 of the said contact member, as shown inFig. 2-. In either case, it will be evident that no great exactness offit will be required between the auxiliary insulating cylinder 14 andthe members separated by the same; also that the screw 5 constitutes ametallic fastening member which simultaneously fastens the shell 4 tothe body of the plug and grounds the terminal 6 to the shell 4c, whilethe outward punching of the portion 20 enables me to make the retaininglugs of the plug integral with the shell, so that they cannot workloose. It will also be obvious that when the connector plug of myinvention is used with a socket having a metal casing 21 contactinglyinterfitting the metal shell 22 of a lamp 23, which shell is connectedto one end of the filament of the lamp, the said end of the lampfilament is electrically connected through the shell 22, casing 21,screw 5 and terminal 6 to one wire 17 of the circuit.

I claim as new and desire to cover by Letters Patent:

1. In a wire-connecting plug for a socket having a metal casing, aninsulating body; a pair of wire terminals carried thereby; a metal shellmounted upon one end of the insulating body, the said shell slidinglyinterfitting the casing of the socket and electrically connected to oneof the wire terminals; an auxiliary insulating body housed within thesaid shell; a contact member carried by the auxiliary insulating body;the outer end of the said shell being contracted to secure theauxiliaryinsulating body and the contact member carried thereby within the saidshell; and a spring-pressed member interposed between the contact memberand the other of the said wire terminals.

2. In a wire-connecting plug for a socket having a metal casing, a maininsulating body; a pair of wire terminals carried thereby; a metal shellmounted upon one end of the insulating body, the said shell slidinglyinterfitting the casing of the socket and electrically connected to oneof the Wire terminals; an auxiliary insulating body housed within thesaid shell; and a contact member carried by the auxiliary insulatingbody and electrically connected to the other of the said wire terminals,the outer end of the said shell being contracted to secure the auxiliaryinsulating body within the said shell.

3. In a wire-connecting plug for a socket having a metal casing, aninsulating body; a pair of wire terminals carried thereby; a metal shellmounted upon one end of the insulating body, the said shell slidinglyinterfitting the said casing of the socket; a metallic fastening memberelectrically connecting the said shell and one of the wireterminalscarried by the insulating body, the said fastening member extendingthrough a portion of the insulating body and thereby securing both theshell and the last-named wire-terminal to the insulating body; and acontact member mounted within the said shell and insulated therefrom andelectrically connected to the other of the said wireterminals.

4. In a wire-connecting plug for a socket having a metal casing, a maininsulating body; a pair of wire terminals carried thereby; a metal shellmounted upon one end of the insulating body, the said shell slidinglyinterfitting the casing of the socket and electrically connected to oneof the wire terminals; an auxiliary insulating body housed within thesaid shell; and a contact member carried by the auxiliary insulatingbody and electrically connected to the other of the said wire terminals.

5. In a wire-connecting plug for a socket having a metal casing, aninsulating body; a pair of wire terminals carried thereby; a metal shellmounted upon one end of the insulating body, the said shell slidinglyinterfitting the casing of the socket and electrically connected to oneof the wire terminals; a contact member insulatingly mounted within thesaid shell; and a springpressed member interposed between the contactmember and the other of the said wire terminals.

In testimony whereof I have signed my. name in presence of twosubscribing witnesses.

. GEORGE C. KNAUFF. \Vitnesses:

Manna SGHEIBLE, G. BINNEVILLE.

